package util;

/**
 * Created by ab on 2016/11/2.
 * 范围
 */
public class Range {
    //Produce a sequence [0..n)
    public static int[] range(int n){
        int[] result=new int[n];
        for(int i=0;i<n;i++)
            result[i]=i;
        return result;
    }
    //Produce a sequence [start..end)
    public static int[] range(int start,int end){
        int sz=end-start;
        int[] result=new int[sz];
        for(int i=0;i<sz;i++)
            result[i]=start+i;
        return result;
    }

    //Produce a sequence [start..end) incrementing by step
    public static int[] range(int start,int end,int step){
        int sz=(end-start)/start;
        int[] result=new int[sz];
        for(int i=0;i<sz;i++)
            result[i]=start+(i*step);
        return result;
    }
}
